Vibrator



Oct. 26, 1937. H. M. DRESSEL VIBRATOR Filed Nov. 27, 1956 J u 7/// 7 I v A I I Patented Oct. 26, 1937 VIBRATOI Henry Chicago, n|., assignor to on Manufacturing Company, Chicago, 111., a corporatlon of Illinois UNITED 1 STAT P NT.-

Application November 27, 1936, Serial No. 112,889 21 Claims. (Cl. 175- 365) This invention relates to vibrators and particularly to vibrators for converting direct current into pulsating current to be stepped up for use in radio receivers. Because of the make and break of vibrators, the wave front of the interrupted current presents many jagged peaks. Considerable high frequency components are present which for best results should be eliminated. Because of the high frequency, the elimination must be as close to the source as possible since otherwise capacitance and inductance of long leads tend to promote radiation. The use of resistance capacity and inductance across vibrator contacts is quite old and, in fact, is an obvious expedient in the electrical art. However, the diiiiculty has been to connect the resistance in such a way that long lengths of leads are avoided. a In this construction the resistance is built in the device and is located so close to the source of disturbance as to effectively damp out the disturbing frequencies.

Referring to the drawing:

Figure 1 is an elevation view partly in section of a vibrator embodying the invention.

Figure 2 is a sectional view on line 2-2 of Figure 1.

Figure 3 is a section along 3-3 of Figure 1. Figure 4 is a circuit diagram of the vibrator. Figure 5 is a modification.

Figure 6 is a further modification.

The vibrator in general comprises a magnetizable frame I bent in a generally U shape with a bight 2 and arms 3 and 4. At the bight, a pole piecei is provided terminating in an offset pole face 6. Disposed around pole piece 5 is a magnetizing coil 1.

Between the arms 3 and 4 of the frame a stack is clamped, the stack including a centrally disposed reed It. This reed carries an armature II at the free end thereof adapted to co-act with pole face 6. Reed l0 carries contact supporting members l2 on each side thereof and suitably riveted at l3 and It. The contact carrying members l2 have arms I! which extend upwardly and outwardly away from the reed and at their free ends carry movable contacts i6 and i1. It will be noted that the interior of the feed is cut out at and a small spring 2| is disposed therein. This reed 2! .is supported from the main reed l0. Reed 2| carries a driving contact 22 at the end thereof. The reed and contact carrying details are described and claimed in copending applica-' tion Serial No. 758,924.

A stationary drivingcontact 23 is carried by frame I and is adapted to cooperate with the driving contact 22. On each side of reed I! in the stack are metal plates 25 and 26. Against the outside of these metal plates are resistance blocks 21 and 23. These blocks are of any suitable material and preferably have a resistance of 100 or 200 ohms for vibrators operating on 6 volts and handling about watts, and have suilicient mechanical strength to withstand clamping pressure.

Beyond each of the resistance blocks 21 and 23 are stator contact members 33 and 3|. These have stator contacts 32 and 33 on their free ends. Below the stack these contact members 30 and 31 terminate in .bent fingers 3i and 35 for connection purposes.

Beyond stator contact members 30 and 3i, are a pair of mica or other insulating members 36 and 31 after which are disposed metal spacer plates 38 and 33 to build up the stack to the desired thickness. 7

This stack is disposed between the open arms 3 and 4 of the vibrator and is adapted to be rigidly clamped therebetween. For this purpose arms 3 and I are each provided with a pair of apertures through which bolts 40 and H are threaded. In order to prevent short clrcuiting by the bolts, an insulating tube 42 is disposed around each bolt between the frame arms. As is well understood, various apertures in the stack members are large enough to accommodate the insulators. The resistance blocks may have slots 43 and 44 cut in at the opposite-ends to clear the mounting bolts and the insulating tubes. The nuts 45 on the bolts draw up the stack to hold the entire construction tight.

The entire construction is preferably mounted on a rubber. mounting which is carried by a suitable base 5i having a plurality of tube type prongs 52 extending therefrom. The entire vibrator is covered by a can 53 cooperating with base II.

The various contact members are connected to the prongs'52.

grounding to frame and the other lead 6! con- .nected to prong 52A. Reed I0 is connected through contact prongs 523 to the high side of a battery. Contacts 32 and 33 are connected through prongs 52C and 52D to the outside terminals of a transformer primary 63. The center 64 of the primary is connected to the other battery terminal and also to prong 52A. A short circuited coil 65 is preferably wound in blfllar relationship to magnetizing coil 1 as disclosed and claimed in Patent 2,012,123.

.ll then come the stationary contact carrying mom- Resistances 61 and 68 representing blocks 21 and 28 connect reed i0 and contact bearing arms 30 and 3|. Because of the ratio ofhigh transverse area to thickness, desirable capacitance is present and is indicated by the dotted hers 30 and 3|. Additional insulating plates 14 and I5 come next to members 30 and 3i. It will be noted that plate 14 comes next to arm 3 of the frame. Beyond plate 15, a metal connector finger 16 from reed i0 is disposed. Between frame arm 4 and finger 16, resistance block I7 is disposed. Hence this block is across driving contacts 23. If desired, shorted coil 65 may be dispensed with.

Referring to Figure 6, only one resistance block is used across 'both stationary load circuit contacts. Thus reed l0 has insulating plates 80 and 8| on opposite sides thereof. Next to 80 a metal plate 82 is disposed and thereafter comes insulating block 85. Beyond 8| and 85 come contact carrying members 30 and 3| and thereafter insulators 86 and 81 complete the stack. Plate 82 is connected by a finger B4 to member 3|. With the customary transformer connections as shown, resistance block 85 is across contact members 30 and 3| connected to the ends of the transformer primary. Obviously the driving contacts could also be shunted by a resistance block.

It is to be understood that while this invention has been explained in connection with a vibrator having separate driving contacts and a shorted coil, it is'not to be restricted thereto. The identical construction may be used with the type of vibrator wherein the load and driving contacts are the same as in Patent 1,960,599 to Silva.

What is claimed is:

l. A device for converting direct current to interrupted currents suitable for transformation comprising an electric motor, cooperating contacts, means for making and breaking said contacts upon motor operation, means for mounting said contacts on said motor, said means including a resistance block having substantial crosssectiohal area with conducting members on each side of the block forming an electrical connection directly across said cooperating contacts of low enough resistance and high enough capacitance to suppress voltage surges developed across the contact points.

2. In combination, an electric motor, cooperating contacts, means for making and breaking said contactsupon motor operation, means for mounting said contacts on a base, said means including a resistance block having substantial crosssectional area with conducting members on each side of the block forming an electrical connection directly across said contacts of low enough resistance and high enough capacitance to dis.-

sipate voltage peaks across said contacts, a

transformer having a primary, and connections between said primary and contacts whereby dur-' primary circuit is proximity to said electromagnet, a contact carried by said reed, a cooperating stationary contact carried by said base, connections between the magnetizing coil and cooperating contacts for effecting reed vibration, and a. resistance block carried by said base and forming the support-v ing means for one of the contact carrying parts whereby a sufficiently low resistance shunt is provided across contacts to dissipate voltage peaks across the contacts.

4. A vibrator comprising a base, an electromagnet carried thereby, a vibratable reed, means for mounting said reed on said base, said reed having an armature in proximity to said electromagnet, a contact carried by said reed, a pair of cooperating stationary contacts, means for mounting said stationary contacts on said base, connections between said contacts whereby reed vibration is effected upon circuit energization, and at least one resistance block forming the stationary contact mounting means making a connection across the stationary contacts of sufficiently low resistance to dissipate voltage peaks developed across contacts.

'5. The structure of claim 4 in combination with a transformer having a primary, and connections between said primary and contacts.

6. A vibrator comprising an elongated frame, a magnetizable core carried by one end of said frame and having an active pole face, a mag netizing coil for said core, a magnetizable reed, a driving contact and load circuit contact carried by said reed, stationary contacts cooperating with said two reed contacts, means for supporting said reed at the other end of the frame, means for supporting the stationary contacts from said frame, connections between said coil and said driving contacts for effecting vibration of the reed, one of said contact supporting means including a resistance block functioning as a supporting member between one of the stationary contacts and the frame and forming a connection across the cooperating contacts of low enough resistance to-dissipate sharp high frequency voltage peaks developed across the contact points during the normal operation of the device.

7. A vibrator comprising an elongated frame, a magnetizable core carried by one end of said frame and having an active pole face, a magnetizing coil for said core, a short circuited coil inductively coupled to said magnetizing coil, a magnetizablerecd, at least one contact carried byv said reed, a stationary contact cooperating therewith, means for supporting said. reed at the other end of the frame, means for supporting the stationary contact on said frame, connections between saidcoil and contacts for effecting vibration upon energization, one of said contactsupporting means including a resistance block functioning as a supporting member between the stationary contact and the frame and forming a. connection across the cooperatingcontacts of low enough resistance to dissipate sharp high frequency voltage peaks developed across the. conitalaci'i points during the normal operation of the ev ce.

8. A vibrator comprising an elongated frame,

a magnetizable core carried by one end of said frame and having an active pole face, a magnetiz'ing coil for said core, a magnetizable reed, a driving contact and loadcircuit contact carried by said reed, stationary contacts cooperating with each of said reed contacts, means for supporting said reed at the other end of the frame, means for supporting the stationary contacts from said frame, said means including a resistance block, connections between said coil and driving contacts for effecting vibration of the reed, said resistance block forming a connection across one pair of the cooperating contacts of low enough resistance and having a sufficiently great cross sectional area to impart capacitance thereto to dissipate sharp high frequency voltage peaks developed across the contact points during the normal operation of the device.

9. A vibrator comprising an elongated frame, a magnetizable core carried by one end of said frame and having an active pole face, a' magnetizing coil for said core, a magnetlzable reed, a driving contact and load circuit contact carried by said reed, stationary contacts cooperating with said two reed contacts, a stack at the other .end of said frame for supporting said reed and certain of said stationary contacts, connections between said coil and driving contacts for effecting vibration of the reed, a resistance block in said stack forming a spacing member between the reed and contact supporting means, and means for clamping said stack.

10. A vibrator comprising an elongated frame, a magnctizable core carried by one end of said frame and having an active pole face, a magnetizing coil for said core, a magnetizable reed, a driving contact and load circuit contact carried by said reed, stationary contacts cooperating with said reed contacts, connections between said coil and driving contacts for operating the vibrator,

spring fingers for supporting certain of said stationary contacts, means for supporting said fingers and reed at the other end of said frame, said means including resistance blocks separating said fingers from said reed and forming a connection therebetween of low enough resistance and high enough capacitance to dissipate sharp high frequency peaks developed across the contact points during the normal operation of the device.

11. A vibrator comprising an elongated U shaped frame having a pair of open arms, a magnetizable core carried by the bight of said U and extending toward said open arms and having an active pole face at the end thereof, a magnetizing coil for said core, a reed disposed between said open arms and extending toward said pole face, at least one contact carried by said reed, stationary contacts cooperating with said reed contact, metal fingers for supporting said stationary contacts, connections between said coil and contacts for operating the vibrator, and means for supporting said fingers and reed between said frame arms, said means including at least one resistance block forming a connection across cooperating contacts of low enough resistance to dissipate sharp high frequency voltage peaks developed across the contact points during the normal operation of the device.

12. A vibrator comprising an elongated U shaped frame having a pair of open arms, a magnetizable core carried by the bight of said frame and having an active pole face, a magnetizing coil for energizing said core, a reed disposed between said arms and extending toward said core, driving and load circuit contacts carried by said reed, a cooperating stationary contact carried by said frame cooperating with said driving con tact, connections between said coil and driving contacts for effecting vibration of the reed upon energization of the circuit, stationary load circuit contacts cooperating with said load circuit reed contact, metal fingers for supporting said stationary load circuit contacts, means for supporting said fingers and said reed between said frame arms, said means including resistance blocks directly connecting said fingers and said reed, said blocks having a low enough resistance and sufillciently large capacity to dissipate sharp high frequency voltage peaks developed across the contact points during the normal operation of the device.

13. The vibrator of claim 12 wherein a short circuited closely coupled coil cooperating with said magnetizing coil is provided.

14. In a device of the character described, a frame, at least one contact carried by said frame, a reed carrying a contact for cooperation with said frame contact and adapted to carry current upon the closure of said contacts and energization thereof, means for moving said reed to open and close said cooperating contacts, a resistance block on said frame electrically connected to said frame contact, and means for supporting said reed directly on said block so that the stationary part of the reed is electrically connected thereto, said resistance block having a sufficiently low resistance to eliminate voltage surges across the contacts.

15. In a circuit interrupter, a base, a stationary contact carried by said base, a resistance block carried by said base and electrically connected to said contact, a movable contact member coopcrating with said stationary contact, and means for mounting said movable member on said block so that an electrical connection therebetween is made, and means for opening and closing said contacts whereby said resistance block suppresses voltage surges across said contacts.

16. .The structure of claim 15 wherein said block has substantial cross-sectional area and wherein the connections thereto are made to the entire faces whereby a condenser action is obtained.

17. In a vibrator, a frame having a magnetizable pole piece provided with a pole face thereon, a magnetizing coil therefor, a stack on said frame, a reed rigidly mounted on said stack and having an armature adjacent the pole face for vibration along the face, a contact carried by said reed, a cooperating stationary contact carried by said frame, connections between said contacts and coil for vibrating the reed upon circuit energization, and a resistance block included in said stack connected in the driving circuit for suppressing voltage surges developed in the magnetizing coil and normally tending to produce contact arcing.

18. The structure of claim 17 wherein said resistance block has substantial cross-sectional area and has good conducting surfaces on opposite sides to form a condenser.

19. In a vibrator, a frame having a magnetizable pole piece provided with a pole face thereon, a magnetizing coil therefor, a reed rigidly mounted on said frame and having an armature adjacent the pole face for vibration along the face, a contact carried by said reed, a cooperating stationary contact carried by said frame, connections between said contacts and coil for vibrating the reed upon circuit energization, and a resistance block connected in the driving circuit for suppressing voltage surges developed in the magnetizing coil and normally tending to produce contact arcing, said resistance block having substantial cross-section and being provided with conducting surfaces on each side thereof so that a substantial condenser action is obtained.

20. The structure of claim 19 wherein said resistance block is connected directly across the driving contacts.

resistance block connected across said contacts having sufiiciently low resistance for suppressing voltage surges across said contacts, said block having sumciently large cross-section and being provided with conducting plates on each side thereof so that a substantial condenser action results.

HENRY M. DRESSEL. 

